Which of the following skin care products attracts moisture to the skin?

Humectants are substances that have the ability to attract moisture from the environment and from the deeper layers of the skin to the skin's surface. This hydration helps keep the skin moisturized, supple, and plump. Common humectants include ingredients like glycerin, hyaluronic acid, and aloe vera. They are commonly found in many skin care products, especially moisturizers and serums, because they help maintain skin hydration, which is essential for a healthy complexion.

In contrast, emollients primarily work to soften and smooth the skin by filling in gaps between skin cells, but they do not have the specific moisture-attracting properties of humectants. Proteins play a role in skin structure and repair but are not designed to draw moisture to the skin. Surfactants are mainly used for cleansing and help remove dirt and oils from the skin, rather than attracting moisture. Thus, humectants are uniquely effective for enhancing hydration and moisture retention in the skin.